Area Code 423-443 located in CHATTANOOGA, HAMILTON, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 443 City : CHATTANOOGA County : HAMILTON State : TN (Tennessee) NXX Use Type : Landline NXX Intro Version : 2002-10-25 FIPS (Federal Information Processing Standards) : 47065 LATA (Local Access Transport Area) : 472 Rate Center : CHATTNOOGA ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 37450 Other Information NPANXX : 423443 County Population : 0 Switch CLLI (Common Language Location Identifier) : CHTGTNNSX0X MSA CBSA (Core Based Statistical Area) : Chattanooga, TN-GA MSA CBSA Code (Core Based Statistical Area) : 16860 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : LEVEL 3 COMMUNICATIONS, LLC - TN OCN (Operating Company Number) : 4806 Coverage Area Name : CHATTANOOGA Latitude : 35.0413 Longitude : -85.3124 ‹ previous : 423-443 next › : 423-444 Telephone Number List 423-443-0000 ~ 423-443-9999